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Stockholders' Equity (Summary of Purchases of Common Stock) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended | 24 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
1.0 Billion Dollar Share Repurchase Program Closed [Member] |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Total Number of Shares Purchased |  | 2,243 |  |  |  | 2,243 |
Dollar Value of Shares Purchased |  | $ 38 |  |  |  | $ 38 |
Average Price Paid per Share |  | $ 16.85 |  |  |  | $ 16.85 |
5.0 Billion Dollar Share Repurchase Program Closed [Member] |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Total Number of Shares Purchased |  |  | 68,625 | 78,149 |  |  | 146,774
Dollar Value of Shares Purchased |  |  | $ 1,827 | $ 2,978 |  |  | $ 4,805
Average Price Paid per Share |  |  | $ 26.62 | $ 38.11 |  |  | $ 32.74
1.6 Billion Dollar Share Repurchase Program Open [Member] |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Total Number of Shares Purchased | 13,983 |  |  |  | 13,983 |  |
Dollar Value of Shares Purchased | $ 589 |  |  |  | $ 589 |  |
Average Price Paid per Share | $ 42.15 |  |  |  | $ 42.15 |  |

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